* include/ruby/intern.h (rb_gc_set_params): Deprecate
  rb_gc_set_params because it's only used in ruby internal.

* internal.h (ruby_gc_set_params): Declare rb_gc_set_params's
  alias function.

* gc.c: ditto.

* ruby.c: use ruby_gc_set_params.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43794 b2dd03c8-39d4-4d8f-98ff-823fe69b080e